I've been having this problem with fruitflies breeding in my dubia bin. The bin has always had a lid on it and have no idea how they got there in the first place. Just today upon opening the lid so I can get some roaches to feed my pets, a swarm of fruitflies flew out. The tub is kept in my bedroom so you know how upset my wife was when she saw them on her bed, vanity mirror, sink and tub. I'm trying to figure out a way to get rid of them but find it hard. I really don't want to throw away the roaches and start new. I already cleaned the bin once thinking that would help but a few months later, they're back! HELP!